docs: def change_function_style(self, stripped_record, func_decl_style):
          """Converts a function definition syntax from the 'func_decl_style' to the one that has been
             set in self.apply_function_style and returns the string with the converted syntax."""
          if func_decl_style is None:
              return stripped_record
          if self.apply_function_style is None:
              # user does not want to enforce any specific function style
              return stripped_record
          regex = FUNCTION_STYLE_REGEX[func_decl_style]
          replacement = FUNCTION_STYLE_REPLACEMENT[self.apply_function_style]
          changed_record = re.sub(regex, replacement, stripped_record)
          return changed_record.strip()